Schedule V - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Collective valuation allowance for losses, beginning of period	$ 2	$ 3	$ 3
Allowance for losses on commercial mortgage loans	(1)	(1)	0
Collective valuation allowance for losses, end of period	1	2	3
Valuation allowance on deferred tax assets
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	638	653	964
Charged to Costs and Expenses	(250)	(15)	(311)
Write-offs/Payments/Other	0	0	0
Ending Balance	$ 388	$ 638	$ 653